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Add Abstract, Introduction and Conclusion to the Inductors in DC Circuits Lab. Input calculationElectric Circuits Lab
Instructor: ———–

Lab
Inductors in DC Circuits

Student Name(s): Click or tap here to enter text.

Click or tap here to enter text.

Honor Pledge:

I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned.

Date: 1/1/2018

Contents
Abstract 3
Introduction 3
Procedures 3
Data Presentation & Analysis 4
Calculations 4
Required Screenshots 4
Conclusion 4
References 5

Abstract

(This instruction box is to be deleted before submission of the Lab report)

What is an Abstract?

This should include a brief description of all parts of the lab. The abstract should be complete in itself. It should summarize the entire lab; what you did, why you did it, the results, and your conclusion. Think of it as a summary to include all work done. It needs to be succinct yet detailed enough for a person to know what this report deals with in its entirety.

Objectives of Week 2 Lab 1:

· Measure the resistance and Inductance.
· Use the Oscilloscope and Function generator.
· Measure the LR time constant using VR and VL.
· Understand the effect of series and parallel inductors on LR time constant.

Introduction

(This instruction box is to be deleted before submission of the Lab report)

What is an Introduction?

In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. State the objectives of the lab as well as the overall background of the relevant topic.

· What is the time constant for an RL circuit and what is its significance?
· How do inductors combine in series? (Give formula)
· How do inductors combine in parallel? (Give formula)
· What is inductive reactance? (Give formula)

Procedures

1.
Construct the circuit shown in Figure 1 in Multisim. (You may either use the clock voltage of the function generator.)

Figure 1: RL Circuit

2.
Connect Channel A of the oscilloscope across the resistor and Channel B across the inductor.

3.
Set the voltage source to
5VPP; 300 Hz, Square wave, 50% duty cycle

4. You should be able to see the waveform as shown below. (Use Volts/Div and Time/DIV settings to adjust the signal)

Figure 2. Voltage across the inductor and resistor

5.
Calculate the time constant of an LR circuit. Record the result in
ELECTRIC CIRCUITS I

METRIC PREFIX TABLE

Metric

Prefix

Symbol

Multiplier

Expo-

nential

Description

Yotta

Y

1,000,000,000,000,000,000,000,000

1024

Septillion

Zetta

Z

1,000,000,000,000,000,000,000

1021

Sextillion

Exa

E

1,000,000,000,000,000,000

1018

Quintillion

Peta

P

1,000,000,000,000,000

1015

Tera

T

1,000,000,000,000

1012

Trillion

Giga

G

1,000,000,000

109

Billion

Mega

M

1,000,000

106

Million

kilo

k

1,000

103

Thousand

hecto

h

100

102

Hundred

deca

da

10

101

Ten

Base

b

1

100

One

deci

d

1/10

10-1

Tenth

centi

c

1/100

10-2

Hundredth

milli

m

1/1,000

10-3

Thousandth

micro

µ

1/1,000,000

10-6

Millionth

nano

n

1/1,000,000,000

10-9

Billionth

pico

p

1/1,000,000,000,000

10-12

Trillionth

femto

f

1/1,000,000,000,000,000

10-15

atto

a

1/1,000,000,000,000,000,000

10-18

Quintillionth

zepto

z

1/1,000,000,000,000,000,000,000

10-21

Sextillionth

yocto

y

1/1,000,000,000,000,000,000,000,000

10-24

Septillionth

4-BAND RESISTOR COLOR CODE TABLE

BAND

COLOR

DIGIT

Band 1: 1st Digit

Band 2: 2nd Digit

Band 3: Multiplier
(# of zeros
following 2nd digit)

Black

0

Brown

1

Red

2

Orange

3

Yellow

4

Green

5

Blue

6

Violet

7

Gray

8

White

9

Band 4: Tolerance

Gold

± 5%

SILVER

± 10%

5-BAND RESISTOR COLOR CODE TABLE

BAND

COLOR

DIGIT

Band 1: 1st Digit

Band 2: 2nd Digit

Band 3: 3rd Digit

Band 4: Multiplier
(# of zeros
following 3rd digit)

Black

0

Brown

1

Red

2

Orange

3

Yellow

4

Green

5

Blue

6

Violet

7

Gray

8

White

9

Gold

0.1

SILVER

0.01

Band 5: Tolerance

Gold

± 5%

SILVER

± 10%

EET Formulas & Tables Sheet

Page
1 of
21

UNIT 1: FUNDAMENTAL CIRCUITS

CHARGE

Where:
Q = Charge in Coulombs (C)
Note:
1 C = Total charge possessed by 6.25×1018 electrons

VOLTAGE

Where:
V = Voltage in Volts (V)
W = Energy in Joules (J)
Q = Charge in Coulombs (C)

CURRENT

Where:
I = Current in Amperes (A)
Q = Charge in Coulombs (C)
t = Time in seconds (s)

OHM’S LAW

Where:
I = Current in Amperes (A)
V = Voltage in Volts (V)
R = Resistance in Ohms (Ω)

RESISTIVITY

Where:
ρ = Resistivity in Circular Mil – Ohm per Foot (CM-Ω/ft)
A = Cross-sectional area in Circular Mils (CM)
R = Resistance in Ohms (Ω)
ɭ = Length in Feet (ft)
Note:
CM: Area of a wire with a 0.001 inch (1 mil) diameter

CONDUCTANCE

Where:
G = Conductance in Siemens (S)
R Electric Circuits Lab

Inductors in DC Circuits

I.

Objectives:

After completing this lab experiment, you should be able to:
· Measure the resistance and Inductance.
· Use the Oscilloscope and Function generator.
· Measure the LR time constant using VR and VL.
· Understand the effect of series and parallel inductors on LR time constant.

II.

Parts List:

· Resistor (1) 5.1 kΩ
· Inductor (2) 100mH

III.

Procedures:

Part I:

1.
Construct the circuit shown in
Figure 1 in Multisim. (You may use either the clock voltage component or the function generator.)

PP

Figure 1: RL Circuit

2.
Connect Channel A of the oscilloscope across the resistor and Channel B across the inductor.

3.
Set the voltage source to
5VPP; 300 Hz, Square wave, 50% duty cycle

4. You should be able to see the waveform as shown below. (Use Volts/Div and Time/DIV settings to adjust the signal)

Figure 2. Voltage across the inductor and resistor

5.
Calculate the time constant of an LR circuit.
Record the result in
Table 1 below under the calculated value.

 = L/R

Calculated value

Measured value using VL

Measured value using VR

Time constant ()

19.6 us

20.319 us

20.398 us

Table 1: Calculated and measured time constant values

6. Turn on the cursors on the oscilloscope
7.
Measuring the time constant with VL: (shown in Figure 3)

i.
Set Channel A to “0” to turn off Channel A signal.

ii.
Measure the peak value of the voltage across the resistor, by placing one of the cursors at the peak point _____5.002 V____.

iii.
Calculate the 37% of the above value ___1.85V______.

iv.
Place the second cursor at the voltage calculated above in step (iii).

v.
Observe the change in time (T2-T1) value on the scope, which is the value of one time constant.

vi.
Record the T2-T1 value in
Table 1 above under measured value using VL.

Figure 3: Measuring RL time constant using VL example (L = 150 mH)

Note: your scope screen will be different

8.
Set Channel B to “0” to turn it off.

9.
Set Channel A to “AC”

10. Adjust the Trigger settings, if needed, and you should be able to see the waveform as shown below. (Use Volts/Div and Time/DIV knobs to adjust the signal)

Figure 4: Voltage across the resistor

11.
Measuring the time constant: (shown in Figure 5)

i.

Measure the peak value of the signal, by placing one of the cursors (T1) at the peak point and the other cursor (T2) at the negative peak.
Calculate the total peak-to-peak voltage (T1-T2) _4.998V________.

ii.

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